Allow retrieving the filename from the device list

Supports unlaunch/hiya booting

arm7/src/deviceList.h

@@ -0,0 +1,38 @@
+#ifndef DEVICE_LIST_H
+#define DEVICE_LIST_H
+#include <nds/memory.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct PACKED Device {
+	char driveLetter;
+	struct PACKED {
+		u8 phisicalDrive	: 1; // (0=External SD/MMC Slot, 1=Internal eMMC)
+		u8 zero1 			: 2; // (maybe MSBs of Drive)
+		u8 deviceType		: 2; // (0=Physical, 1=Virtual/File, 2=Virtual/Folder, 3=Reserved)
+		u8 partition		: 1; // (0=1st, 1=2nd)
+		u8 zero2 			: 1; // (maybe MSB of Partition)
+		u8 encrypt 			: 1; // (set for eMMC physical devices; not for virtual, not for SD)
+	};
+	u8 accessRights; // (bit1=Write, bit2=Read)
+	u8 zero;
+	char deviceName[0x10]; // (eg. "nand" or "dataPub") (zeropadded)
+	char path[0x40]; // (eg. "/" or "nand:/shared1") (zeropadded)
+} Device;
+
+
+typedef struct PACKED DeviceList {
+	Device devices[11];
+	u8 zerofilled[0x24];
+	char appname[0x40];
+} DeviceList;
+
+#define __DeviceList (((*(u32*)(((vu8*)__DSiHeader)+0x1D4)) >= 0x02000000) ? ((DeviceList*)((vu8*)(*(u32*)(((vu8*)__DSiHeader)+0x1D4)))) : NULL)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

arm7/src/main.c

@@ -29,6 +29,7 @@
 ---------------------------------------------------------------------------------*/
 #include "my_sdmmc.h"
 
+#include "deviceList.h"
 #include <nds.h>
 #include <string.h>
 
@@ -96,10 +97,13 @@ void aes(void* in, void* out, void* iv, u32 method)
 
 int my_sdmmc_nand_startup();
 
+#define DEVICE_LIST_SENTINEL *(vu32*)0x02300020
+
 //---------------------------------------------------------------------------------
 int main()
 //---------------------------------------------------------------------------------
 {
+	DEVICE_LIST_SENTINEL = 0;
 	// clear sound registers
 	dmaFillWords(0, (void*)0x04000400, 0x100);
 
@@ -119,6 +123,12 @@ int main()
 
 	if (isDSiMode() /*|| ((REG_SCFG_EXT & BIT(17)) && (REG_SCFG_EXT & BIT(18)))*/)
 	{
+		if(__DeviceList)
+			memmove((vu8*)0x02300024, __DeviceList, sizeof(DeviceList));
+		else
+			memset((vu8*)0x02300024, 0, sizeof(DeviceList));
+		DEVICE_LIST_SENTINEL = 1;
+		
 		vu8 *out=(vu8*)0x02300000;
 		memset(out, 0, 16);
 

arm9/src/deviceList.c

@@ -0,0 +1,27 @@
+#include "deviceList.h"
+#include <string.h>
+
+#define DEVICE_LIST_SENTINEL *(vu32*)0x02300020
+#define DEVICE_LIST_ADDR (vu8*)0x02300024
+
+DeviceList* getDeviceList(void)
+{
+	static bool gotDeviceList = false;
+	if(!gotDeviceList) {
+		while(!DEVICE_LIST_SENTINEL);
+		DeviceList* list = (DeviceList*)DEVICE_LIST_ADDR;
+		bool isSd = strncmp(list->appname, "sdmc", 4) == 0;
+		if(!isSd && strncmp(list->appname, "nand", 4) != 0)
+			return 0;
+		if(isSd)
+		{
+			//transform sdmc:/ to sd:/
+			memmove(list->appname + 2, list->appname + 4, sizeof(list->appname) - 4);
+			list->appname[sizeof(list->appname) - 1] = '\0';
+			list->appname[sizeof(list->appname) - 2] = '\0';
+		}
+		gotDeviceList = true;
+	}
+	
+	return (DeviceList*)DEVICE_LIST_ADDR;
+}

arm9/src/deviceList.h

@@ -0,0 +1,38 @@
+#ifndef DEVICE_LIST_H
+#define DEVICE_LIST_H
+#include <nds/memory.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct PACKED Device {
+	char driveLetter;
+	struct PACKED {
+		u8 phisicalDrive	: 1; // (0=External SD/MMC Slot, 1=Internal eMMC)
+		u8 zero1 			: 2; // (maybe MSBs of Drive)
+		u8 deviceType		: 2; // (0=Physical, 1=Virtual/File, 2=Virtual/Folder, 3=Reserved)
+		u8 partition		: 1; // (0=1st, 1=2nd)
+		u8 zero2 			: 1; // (maybe MSB of Partition)
+		u8 encrypt 			: 1; // (set for eMMC physical devices; not for virtual, not for SD)
+	};
+	u8 accessRights; // (bit1=Write, bit2=Read)
+	u8 zero;
+	char deviceName[0x10]; // (eg. "nand" or "dataPub") (zeropadded)
+	char path[0x40]; // (eg. "/" or "nand:/shared1") (zeropadded)
+} Device;
+
+
+typedef struct PACKED DeviceList {
+	Device devices[11];
+	u8 zerofilled[0x24];
+	char appname[0x40];
+} DeviceList;
+
+DeviceList* getDeviceList(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

arm9/src/main.c

@@ -7,6 +7,7 @@
 #include "version.h"
 #include "unlaunch.h"
 #include "nitrofs.h"
+#include "deviceList.h"
 
 volatile bool programEnd = false;
 static volatile bool arm7Exiting = false;
@@ -155,7 +156,9 @@ int main(int argc, char **argv)
 		return 0;
 	}
 	
-	const char* installerPath = (argc > 0) ? argv[0] : "sd:/ntrboot.nds";
+	DeviceList* deviceList = getDeviceList();
+	
+	const char* installerPath = (argc > 0) ? argv[0] : (deviceList ? deviceList->appname :  "sd:/ntrboot.nds");
 	
 	if (!nitroFSInit(installerPath))
 	{